Means for cleaning metals preparatory to welding



's. c. CARY AND 1. M. BETTON.

MEANS FOR CLEANING METALS PREPARATORY TO WELDING.

APPLlCATlON FILED FEB=8,19I7.

Patented June 13, 1922 g I a awvewfozs S. C. CARY AND J M. BETTON.

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Patented June 13, 1922.

m'rso STATE'S' PATENT AOFFICE.

SPENCER G. CARY, OF BROOKLYN, AND JAMES M. BETTON, OF MOUNT VERNON, NEW

YORK, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO CARY MANUFAC-TUBING COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

MEANS FOR CLEANING METALS PREPARATORY r0 WELDING.

Specification of Letters Patent. Patented J ne 13 1922.

Application filed February 8, 1917. Serial No. 147,850.

To all whom it may concern Be it known that we, SPENCER C. CARY andJAMES M. BETTON, both citizens of the United States, residin at the cityof New York, borough, of Kings, and State of New York, and Mount Vernon,Westchester County, State of New York, respectively, have invented acertain new and useful Means for Cleaning Metals Preparatory t0 Welding,of which the following is a specification.

This invention is an apparatus for removing the scale or oxidation fromsheet metal,

the same being useful, more particularly, in connection wlth a processof welding by electric heat and pressure as disclosed in an applicationfiled by one of the parties hereto, Spencer C. Cary, Serial No. 89289,although it is manifest that the apparatus of the present invention maybe used for other purposes.

The object of the invention is to effect the removal of the scale oroxidation from the marginal portions of sheet metal in a thoroughmanner, to the end that the operation upon said marginal portions of themetal may be carried on expeditiously and economically, whereby thesubsequent step of welding is accomplished efiiciently owing to the factthat the resistance to the fiow of the welding current offered by thecleaned marginal portions of the metal is uniform throu hout the lengthof the resulting seam weld lietween the contiguous edges of two piecesof sheet metal.

Further, the invention has in View to enable the sheet metal to beintroduced into the apparatus for a definite predetermined dis tance; toprovide for the control of the apparatus at will of an attendant, and tosecure precision and efficiency in the cleaning operation upon themetal.

Stated in general terms, the invention com rises a chamber, means forlocating. the wor in the form of sheet metal in a definite positionwithin the chamber, and means for directin a sand blast into contactwith the work, w ereby the attrition of the sand blast'upon the surfaceof the work removes rooklyn, county of' tween the work or metal and'thesand blast, to the end that the field of said sand blast 1s restrictedto a definite marginal portion of the work or metal.

The invention embodies, also, the use of a plurality of nozzlespositioned for directing sand blasts into contact with the respectivesurfaces of the sheet metal, combined with means for effecting arelative movement between the work and said nozzles.

The invention embodies, also, the provision of means for supporting oneor more nozzles in position for movement alon a definite path withrespect to the margina portion of the work.

The invention embodies, also, the employment of means for impartingmovement slmultaneously to a plurality of sand blast nozzles so as toobtain the action of the sand blasts against the respective surfacesofthe sheet and along definite paths for the removal of scale from themarginal portions of said sheet. I

Further, the invention consists in the provision of means forcontrolling at will the How of air through the apparatus; further,

in means for excluding the escape of the direction substantially atright angles to Figure 1, with the operating chamber partly broken away,and illustrating the position of the work within the chamber asdetermined by the work-locating devices.

Figure 3 is a sectional plan view illustrating the operating means forimparting the traversing movement to the blast nozzles, and the meansfor controlling said operating means and for controlling the admissionof the blast to said nozzles.

The working chamber A is formed by a drum or casing 03 provided with ahopperlegs I).

Shaped bottom w, and from the header of said drum extends an exhaustpipe I) for carrying off the fine dust evolved by the operation of thesand blast wlthm the chamber. The hopper-shaped bottom part a of thedrum is adapted to contain a sultable quantity of sand for blastingpurposes, as shown in Figures 1 and 2. The drum is supported at anelevation suitable for the operator by any suitable means, such as theIn one side of the drum is an opening Z3 adapted to be closed ordinarilyby a door B which may be opened and closed at will for the operator toobtain access to the chamber when desired.

Work-locating devices are posltloned w thin the chamber for the purposeof pos1t1oning the work accurately in the path of a sand blast or sandblasts, said work-locating devices being substantially in the horizontalplane of the door B and in the opposite side of the drum a from saiddoor, see Eigure 3. One part of the-work-locating devices is a bell C,preferably tapering 1n form and positioned within a suitable openlngprovided in the drum. At the narrow or reduced end of the tapering bellis a slot 0,- whereas at the wide mouth of the bellis a marginal flangec positioned in opposlng relation to a side wall of the drum a anadapted to be secured to said drum by bolts 0 a gasket 0 beingpositioned between the flange of the bell and the drum so as to becompressed by tightening the bolts, and thus secure an air-tightconnection between the bell and the drum. Secured fixedly within thebell C is a rest plate D upon which the metal to be treated is placedwhen'it is introduced'into the chamber, said rest plate being providedwith guides d, as shown in Figures 2 and 3. The guides are securedrigidly to the rest plate and are spaced relatively to each other toreceive between sa d guides the material to be operated upon, saldmaterial being represented in the drawings as a piece of flat sheetmetal X. The guides embrace the respective side edges of the metal sheetX and they cooperate with the rest plate in locating the material in thepath of the blasts.

Another part of the work-locating devices is a stop E, herein shown as ascrew positioned opposite to the slot-c of the bell, said stop beingfixedly supported in position by appropriate means so as to lie in thepath of the metal X and thereby arrest the inward movement of said sheetmetal X in the operation of introducing the latter into the chamber. Thescrew E is supported in a transverse member of the bail e, therespective end portions of which are fixed to the bell G at therespective sides thereof, as shown in Figure 3, said screw E beingprovided with a check nut e and with. a transverse. @d 8 the latteraffording convenient Walls of the bell, and thus the flaps occupy aconverging relation toward the slot 0 of the bell, whereby the flaps areadapted to meet at their free edges in order to temporaril close theslot 0 of the bell and thus preclu e the escape of sand through the belland around the operator. It is apparent, however,'that the free edges ofthe flaps are yieldable upon thrustin the material X in a forwarddirection, w ereby the material is adapted to protrude at its marginalportion through the slot 0 of the bell in a manner toexpose saidmarginal portion to the 'sand blasts wlthin the chamber, such inwardthrust or movement of the material X being arrested by contact with stopE.

G, H designate the sand blast nozzles, the same being respectivelypositioned above and below the work-locating devices just dc scribed,said nozzles facing toward each other in a manner to direct sand blastsagainst the respective surfaces of the work X along the marginal portionthereof. The nozzles are movable relatively to the work-locating devicesin order to direct the blasts against the material X throughout theWidth thereof. Means are provided for mounting or supporting the nozzlesin movable relation to the material, and it is preferred to employmovement-imparting means which acts to shift the nozzles simultaneouslywith respect to the work. The nozzles may be mounted in various ways,but it is preferred to pivotally support said nozzles for swingingmovement relatively to the material to be operated upon. The uppernozzle G is connected with a pipe 9 terminating in an elbow g which iscoupled by a union g to a branch pipe 9 whereby the nozzle G ispivotally supported by the union 9 on the branch pipe 9 In like mannerthe nozzle H is carried by a pipe h attached to a sleeve h andterminating in an elbow IF, the latter being connected by a coupling kto a branch pipe 72. so that the nozzle H is supported for pivotalmovement, the union it being the axis of movement. The pipe 9 of thenozzle G is provided with a sleeve 5 to which is connected asand-feeding pipe I, and into this downwardly within the chamber for thelower open end of said pipe to be surrounded by the sand present in thehopper bottom a ter extending through a suitable opening in the drum aas shown in Figure 1. To this blast pipe K is connected a feed pipe laleading from a reservoir or other source of pressure supply. Saidblastpipe K is provided with a suitable valve is the movable member ofwhich has an arm to which is attached a link kithe latter extendingdownwardly to a treadle lever K, whereby the operator is enabled to openthe valve when it becomes necessary to supply the air blast through thepipe K to the jet nozzles J J, the effect ofwhich is to create a sandblast adapted to be delivered by the nozzles G H against the respectivesurfaces of the material X along the mar inal portion thereof;

T e means for impartin movement simultaneously to nozzles G, will now bedescribed, although it is apparent that any equivalent means may beemployed. A stuffing box m is attached rigidly to a wall of the drum,through which stufling box is free to slide a rod L, the inner end ofwhich is provided with a crosshead Z, to the ends of which crosshead arepivoted links Z, the other ends of which links'are pivoted to the tubesh of nozzles G H, respectively. The outer end of the reciprocating rod Lis pivoted to a slide M, the latter being retained in a fixed guideway mon an exterior frame M. This slide is provided with a friction roller nwhich operates in a groove n of a rotary cam N, the latter being securedfixedly to a shaft 0 en orted in suitable bearings 0 on the frameMounted loosely on the shaft 0 is a gear -P provided with a clutchmember p and with the gear meshes a driving pinion on a drive shaft P. Atubular shaft Q is mounted on the shaft 0, said tubular shaft being freeto slide along the shaft 0 and being keyed to said shaft 0 for rotationtherewith. The tubular shaft Q is provided with a clutch member 9adapted for cooperation with the clutch member ;0 of the driving gear P,but when the shaft Q is moved away from the gear P, its clutch member 9is free from engagement with the clutch member 72, thus allowing theshaft 0 to remain stationary, whereas the gear P will be driven by theshaft P The tubular shaft is provided at one end with a groove 9 inwhich operates the forked end of a shipper lever R, to one end of whichis pivoted an operating rod 1', the latter being provided at its otherend with a hand-gri 1', whereby the rod 1' and shipper lever & may beoperated to im art sliding movement to the tubular shaft for the ur oseof effecting the engagement of the c utc mem-- her 9 with the clutchmember 1), so that the gear P will impart rotative movement to the shaft0, the cam N on which shaft operates to impart reciprocating movement tothe rod L and thus give the desired traversing movement simultaneouslyto the nozzles G H.

When the material is first introduced into the chamber and ositionedtherein b .the work-locating devices, the nozzles G occupy the initialposition at one side edge of the work XiTas indicated by. dotted linesat the right of ig. 1, but when the cam N is rotated y the shaft the rodL is moved so as to-shift the nozzles with respect to the work in amanner to direct the blasts across a marginal portion of the material Xuntil the nozzles assume the other dotted line position indicated at theleft of Figure 1, after which time the cam continues in operation inorder, to retract the rod L and to return the nozzles G H to theirinitial ositions. On the return of the nozzles G to their initialpositions and. the backward movement of the 'rod L and the slide M, afinger a of the slide acts on a second shipper lever S which ispositioned in operative relation to the tubular shaft Q for the purposeof imparting sliding movement to sald shaft@ and thus withdraw theclutch member g from the clutch member p, said parts operating as a stopmotion to disengage the-cam N and arrest the rotation thereof when thenozzles G H shall have completed the traversin movement with respect tothe materia It is thought that the operation and advantages of theinvention will be apparent to those skilled in the art from theforegoing description taken in connection with the drawings.

what we claim as new, and desire to secure by Letters Patent is:

1. In an apparatus for cleaning metal in sheet form, a substantiallyclosed chamber, a chambered work-locating member extending inwardly withrespect to said chamber, said member being provided at its inwardlyextending portion with a slot through which is adapted to project amarginal portion of a metal sheet the unexposed surfaces of which arecovered by said chambered member, sand-blasting means positioned withinsaid chamber, and adjacent the slotted portion of said chambered member,and means for imparting to the sand-blasting means move-' ment withrespect to the chambered worklocating member.

2. In an apparatus for cleaning metal in her, a sand-blast nozzlemounted for move- I ment relatively to the slotted portion of saidchambered worklocating member,

to said nozzle adjacent the slotte portion of said work-locating member.

3. In an apparatus for cleanin sheet form, a substantially close metalin chamber,

a chambered work-locating member extend-' in inwardly with respect tosaid chamber, said member being provided at its inwardl extendingportion with a slot through whic is adapted to project a marginalportion of a metal sheet the unex osed surfaces of which are covered bysai chambered member, and a luralit of sand-blast nozzles positionedwlthin said chamber and mounted adjacent the slotted portion of saidchambered member for directing blasts of sand into contact with therespective surfaces of the metal sheet at the marginal portion thereofexposed within said chamber.

4. In an apparatus for cleaning metal in sheet form, a substantiallyclosed chamber, a chambered work-locating member extending inwardly withrespect to said chamber, said member being provided at its inwardlyextending portion with a slot through which is adapted to project amarginal portion of a metal sheet the unexposed surfaces of which arecovered by said chambered member, a plurality'of sand-blastnozzles-positioned within said chamber and mounted for movement adjacentthe slotted portion of sheet form, a substantially closed chamber, a

chambered work-locating member extending inwardly with respect to saidchamber, sai

member being provided at its inwardly extending portion with a slotthrough which is adaptedto project a marginal portion ofa metal sheetthe unexposed surfaces of which are covered by said chambered member, aplurality of sand-blast nozzles positioned within the chamber andmounted on opposite sides of the plane to be occupied by the material,said nozzles bein adjacent the. slotted portion of said wor -locatingmember and said nozzles facing toward the plane of'the slot in saidmember, and means for imparting to said blast nozzles a traversingmovement relatively to the slotted porand' -means for imparting atraversin movement ltgion of said chambered work-locating mem- 6. In anapparatus for cleanin metal in sheet form, a substantially closechamber, a chambered work-locating member. extendin inwardly withrespect to'said'chamber, sa1d chambered member being provided at itsinwardly extending portion with a slot through which is adapted to passa marginal ortion of a metal sheet the remaining suraces of which arecovered by said cham- 'bered member, work-supporting means incooperative relation to said chambered mem-. her, said work-supportingmeans being positionedfor fixedly retaining 'the material in the planeof said slot of the chambered member, and sand-blasting means withinsaid chamber and adjacent the slotted portion of the chambered member.3'

7. In an apparatus for cleaning metal in sheet form, a substantiallyclosed, chamber, a chambered work-locating member of ta ering verticalcross section and :provide at its portion of less cross section with amaterial receiving. slot, said chambered memberextending inwardly withrespect. to said chamber, a work-supporting member positioned fixedlywithin said tapering chambered member'and substantially in the plane ofthe slot therein, and sand-blasting means within said chamber andadjacent the slotted reduced inner portion of said chambered member.

8..In an apparatus for cleanin metal in 1 sheet form, a substantiallyclose chamber, 1 a chambered work-locating member of tapering crosssection and rovided in the reduced portion thereof wit amaterial-receiving slot, said chambered member extending inwardly withrespect to said chamber, 1eldable means for normally closing said s otin the chambered member, and sand-blasting means within said chamber andadjacent the slot of the chambered member.

9. In an apparatus for cleaning metal in 110 sheet form, a substantiallyclosed chamber,

a chambered work-locating member extendin inwardly with respect to saidchamber, said chambered member being provided at its inwardly extendingportion with a slot 115 for the passa e therethrough of the material tobe treate within said chamber, means for normally closing said slot,said slotclosing means being yieldable to the passage of the material tobe-treated, and sand- 120 blasting means within the chamber and adjacent the slot of said chambered member.

10. In an apparatus for cleaning metal in. sheet form, a substantiallyclosed chamber,

a chambered work locating member of taand ositioned substantially in theplane of the s ot in said chambered member, stopping means adjacent theslot at the inner portion 11. In an apparatus for cleaning metal in'sheet form, a substantially closed chamber, a chambered work-locatingmember extendin inwardly with respect to said chamber, said chamberedmember being provided with a material-receiving slot, a plurality ofsand-blast nozzles within said chamber and adjacent the slotted portionof said chambered member, each nozzle being mounted for movement on anaxis extending parallel to the axial line of the chambered member, andmeans for impartin a to-and-fro movement to said blast nozz esrelatively to the slotted portion of said chambered member.

12. In an apparatus for sand blasting sheet metal, the combination witha closed chamber, and a blast nozzle positioned therein, of a hollowwork locating member extending inwardly with respect to said chamber,said member being open on one side thereof for the free passagetherethrough of the material to be operated upon, and said member beingprovided at its opposite side with an openin of small area through whichthe material is adapted to pass, and stopping means positionedsubstantially in alinement with said opening of small area and adjacentsaid blast nozzle.

13. In an apparatus for sand blasting sheet metal, the combination witha chamber, and a blast nozzle positioned therein, of a hollow taperingwork locating member extending inwardly of said chamber, said memberbeing substantially open on one side thereof and provided in itsopposite side with a slot, a work supporting member cooperating withsaid work locating member and positioned in substantially the plane ofthe slot therein, and stopping means within the chamber and incooperative relation to the slot in the work locating member and to saidsand blast nozzle.

14. In an apparatus for sand blasting sheet metal, the combination witha chamber, and a blast nozzle positioned therein, of a chamberedwork-locating member extending inwardly with respect to said chamber,said member bein substantially open on one side and provi ed in itsother side with a slot, yieldable closures positioned in contactingrelation adjacent the slot in said work locating member and adapted toyield to the pressure of the work during the oper ation of inserting thelatter into the chamber, and stopping means for arresting the insertionof the Work so as to expose to the sand blast a margin on the work ofdefinite area.

15. In an apparatus for sand blasting sheet metal, the combination witha closed chamber, a pluralit of blast nozzles positioned therein, andmeans for imparting movement to said blast nozzles, of a hollow worklocating member extending inwardly of the chamber and positioned in aplane intermediate the delivery ends of said blast nozzles, said memberbeing provided with a slot for the passage of the material to beoperated upon, work-supporting means in operative relation to thework-locating member, and stopping means in operative relation to thework locating member and to said blast nozzles.

In testimony whereof we have hereunto signed our names.

SPENCER C. CARY. JAMES M. BETTON.

